Abstract: A mobile communication device (1000) includes a CPU (1300), a first antenna (1110), a first front-end circuit (1120), a second antenna (1210), and a second front-end circuit (1220). The first antenna transmits and receives first signals. The first front-end circuit, located between the first antenna and the CPU, includes a first switch (1122), a first power amplifier (1124), and a first filter. The second antenna transmits and receives second signals. The second front-end circuit, located between the second antenna and the CPU, includes a second switch (1221), a second power amplifier (1223), a second filter (1222), and at least one third filter (1224). The second switch is connected to the second antenna. The second power amplifier amplifies signals from the CPU. The second filter is connected to the second switch and the second power amplifier. The third filter is connected to the second switch.

Abstract: A mobile communication device (1000) includes a CPU (1300), a first antenna (1110), a first front-end circuit (1120), a second antenna (1210), and a second front-end circuit (1220). The first antenna transmits and receives first signals. The first front-end circuit, located between the first antenna and the CPU, includes a first switch (1122), a first power amplifier (1124), and a first filter. The second antenna transmits and receives second signals. The second front-end circuit, located between the second antenna and the CPU, includes a second switch (1221), a second power amplifier (1223), a second filter (1222), and at least one third filter (1224). The second switch is connected to the second antenna. The second power amplifier amplifies signals from the CPU. The second filter is connected to the second switch and the second power amplifier. The third filter is connected to the second switch.

Abstract: A wireless communication device (10) for processing Voice over Internet Protocol signals includes an encoding and decoding module (30), a central processing unit (CPU) (20), a digital signal processor (DSP) (40), and a wireless communication module (50). The CPU communicates with the encoding and decoding module for controlling signal flows of the wireless communication device, and includes a multi-channel serial interface (MCSI) (200), an external memory interface (EMI) (210), and a serial peripheral interface (SPI) (220). The DSP communicates with the CPU via the MCSI and the EMI for compressing signals received from the MCSI and decompressing signals received from the EMI. The wireless communication module communicates with the CPU via the SPI for receiving and transmitting voice packets.